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Metal Bobbin Structure for High Frequency Linear Voice Coil Actuator

IP.com Disclosure Number: IPCOM000081520D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Mulvany, RB: AUTHOR [+2]

Abstract

A short-coil, long-gap electromagnetic linear actuator is constructed with an aluminum bobbin support structure. The bobbin structure provides a lightweight, low-cost design with excellent high-frequency dynamic characteristics.

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Metal Bobbin Structure for High Frequency Linear Voice Coil Actuator

A short-coil, long-gap electromagnetic linear actuator is constructed with an aluminum bobbin support structure. The bobbin structure provides a lightweight, low-cost design with excellent high-frequency dynamic characteristics.

Tubular core 1 incorporates four integral aluminum struts 2 which serve to support the coil former 3 and its attached winding 4. Plastic support block 5 is bonded to the O.D. of the bobbin coil and provides a support for rolling conductor band 6. The coil former 3 and its attached conductor band 6 and coil 4 are placed over the O.D. of the strut assembly, and are preloaded against ear 14 by screws 8 which bear against washers 7. Former 3 incorporates a nonconductive aluminum oxide surface to insulate the former from the bobbin struts
2. The former 3 is split at point 15 to assure a discontinuous eddy current path around the ring. The tension supplied by the coil winding 4 maintains the ring in a rigid circular shape.

The bobbin tube assembly provides a cavity 10 to accommodate the integral crash stop of the voice coil motor actuator, wherein the inside surface of ring 9 and the bobbin wall surface 16 provide bobbin contact surfaces with which to engage the crash stop assembly. Coupling assembly 11 is incorporated in the front portion of the bobbin, and pins 12 serve to register the bobbin with the carriage assembly of the data module.

The strutted bobbin structure may al...